How long do casts of impressions need to sit before they can be analyzed? a) 5 minutes b) 1 hour c) 5 hours d) 24 hours

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.

hello there the answer is d